<script>
    if (window.testRunner) {
        testRunner.waitUntilDone();
        testRunner.setBackingScaleFactor(2, function() { testRunner.notifyDone(); });
    }
</script>
<style>
.box {
    background-color: green;
    width: 80px;
    height: 60px;
    left: 10px;
    top: 20px;
    position: absolute;
}
body {
    margin: 0px;
}
</style>
<div class="box">
</div>
